Measuring range: temperature range: -50 to 70C; temperature range : 1C. Humidity range: 10%~99% RH; humidity difference: 5% RH. Miniature and simple design: thanks to its miniature body and its round shape, the device can be placed discreetly anywhere. The simplest appearance and the most practical functions. The screen can be read very easily without manipulation. Versatile: you can use it in homes, offices, cars, schools, hotels, laboratories, kindergartens, aquaculture, instrument workshops, libraries, factories, greenhouses, basements, garages, garden sheds, 3D printer filament boxes and air-conditioned places, etc. > Indoor humidity control: can measure indoor humidity and temperature, adjust settings of humidifiers and dehumidifiers, ideal for controlling living conditions and home health to prevent colds , dry skin, asthma and mold. What you get: digital hygrometer thermometer*2,. Replace the battery when the screen goes dark.